**Question:**find the slope if it exists of the line containing the points

x=9 is the line that contains those points. x=9 is a vertical line and a vertical line has a slope that is UNDEFINED

m=y+y/x+x

m=-9+-6/9+9

m=-15/18

reduces to m= -3/6

and that reduces to m=-1/3

i think...

undefined b/c its a verticle line and they dont have slopes

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